Which block in Java exception handling ALWAYS executes whether an exception occurs or is caught?
Option A is correct. The finally block always executes after try-catch completion, making it ideal for cleanup operations like closing files or streams.
What is the key difference between String, StringBuffer, and StringBuilder in Java?
Option B is correct. String objects cannot be altered once created. StringBuffer methods are synchronized (thread-safe), while StringBuilder is unsynchronized and faster.
Which keyword is used in Java to achieve thread synchronization for critical code sections?
Option A is correct. The synchronized keyword ensures that only one thread can execute a block or method on a monitored object at a time.
In Java, what does the 'transient' keyword indicate when applied to an instance variable?
Option B is correct. Transient variables are ignored during Object Serialization; their default state is restored upon deserialization.
Which interface in the Java Collections Framework stores unique elements with NO duplicate entries?
Option D is correct. Both Option A and related standard techniques apply here. The java.util.Set collection model models mathematical sets, prohibiting duplicate elements.